Catalyst and a manufacturing method thereof

Abstract

A catalyst can be manufactured using a method which can include preparing a first aqueous solution including zirconium, filling the pores of the porous alumina with the aqueous solution by a pore-filling method using the capillary phenomenon, forming a zirconia layer in the pores of the porous alumina, preparing a second aqueous solution including noble metals, filling the pores of the porous alumina with the second aqueous solution by a pore-filling method using the capillary phenomenon, and drying and baking the porous alumina to carry the noble metals in the pores of the porous alumina formed with a zirconia layer.

What is claimed is: 
     
       1. A method for manufacturing a catalyst in which noble metals are carried in pores of porous alumina comprising:
 preparing a first aqueous solution comprising zirconium; 
 filling pores of a porous alumina with the first aqueous solution by a pore-filling method using a capillary phenomenon in the pores of the porous alumina; 
 drying and baking the porous alumina to form a zirconia layer in the pores of the porous alumina 900° C to 1200° C; 
 preparing a second aqueous solution comprising noble metals; 
 filling the pores of the porous alumina with the second aqueous solution by a pore-filling method using a capillary phenomenon in the pores of the porous alumina; and 
 drying and baking the porous alumina filled with the second aqueous solution to carry the noble metals in the pores of the porous alumina. 
 
     
     
       2. A method for manufacturing a catalyst of  claim 1 , wherein the noble metals in the second aqueous solution comprises palladium and rhodium, and wherein the noble metals are simultaneously carried in the pores of the porous alumina. 
     
     
       3. A method for manufacturing a catalyst of  claim 2 , wherein the weight ratio of palladium and rhodium in the second aqueous solution is about 20:1, and wherein the content of palladium and rhodium in the second pore-filling step relative to the porous alumina is about 1-5 percentage by weight. 
     
     
       4. A method for manufacturing a catalyst of  claim 1 , wherein drying and baking the porous alumina for form a zirconia layer in the pores of the porous alumina is performed at 1100° C.±100° C. 
     
     
       5. A method for manufacturing a catalyst of  claim 1 , wherein dry and baking porous alumina for form a zirconia layer in the pores of the porous alumina is performed at 1100° C. 
     
     
       6. A method for manufacturing a catalyst of  claim 1 , wherein drying and baking the porous alumina filled with the second aqueous solution to carry the noble metals in the pores of the porous alumina is performed at 300-600° C.